1/* 2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (c) 1996,1999 by Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18#if !defined(LINT) && !defined(CODECENTER) 19static const char rcsid[] = "$Id: irs_data.c,v 1.12 2007/08/27 03:32:26 marka Exp $"; 20#endif 21 22#include "port_before.h" 23 24#ifndef __BIND_NOSTATIC 25 26#include <sys/types.h> 27 28#include <netinet/in.h> 29#include <arpa/nameser.h> 30 31#include <resolv.h> 32#include <stdio.h> 33#include <string.h> 34#include <isc/memcluster.h> 35 36#ifdef DO_PTHREADS 37#include <pthread.h> 38#endif 39 40#include <irs.h> 41#include <stdlib.h> 42 43#include "port_after.h" 44 45#include "irs_data.h" 46#undef _res 47#if !(__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 3) 48#undef h_errno 49extern int h_errno; 50#endif 51 52extern struct __res_state _res; 53 54#ifdef DO_PTHREADS 55static pthread_key_t key; 56static int once = 0; 57#else 58static struct net_data *net_data; 59#endif 60 61void 62irs_destroy(void) { 63#ifndef DO_PTHREADS 64 if (net_data != NULL) 65 net_data_destroy(net_data); 66 net_data = NULL; 67#endif 68} 69 70void 71net_data_destroy(void *p) { 72 struct net_data *net_data = p; 73 74 res_ndestroy(net_data->res); 75 if (net_data->gr != NULL) { 76 (*net_data->gr->close)(net_data->gr); 77 net_data->gr = NULL; 78 } 79 if (net_data->pw != NULL) { 80 (*net_data->pw->close)(net_data->pw); 81 net_data->pw = NULL; 82 } 83 if (net_data->sv != NULL) { 84 (*net_data->sv->close)(net_data->sv); 85 net_data->sv = NULL; 86 } 87 if (net_data->pr != NULL) { 88 (*net_data->pr->close)(net_data->pr); 89 net_data->pr = NULL; 90 } 91 if (net_data->ho != NULL) { 92 (*net_data->ho->close)(net_data->ho); 93 net_data->ho = NULL; 94 } 95 if (net_data->nw != NULL) { 96 (*net_data->nw->close)(net_data->nw); 97 net_data->nw = NULL; 98 } 99 if (net_data->ng != NULL) { 100 (*net_data->ng->close)(net_data->ng); 101 net_data->ng = NULL; 102 } 103 if (net_data->ho_data != NULL) { 104 free(net_data->ho_data); 105 net_data->ho_data = NULL; 106 } 107 if (net_data->nw_data != NULL) { 108 free(net_data->nw_data); 109 net_data->nw_data = NULL; 110 } 111 112 (*net_data->irs->close)(net_data->irs); 113 memput(net_data, sizeof *net_data); 114} 115 116/*% 117 * applications that need a specific config file other than 118 * _PATH_IRS_CONF should call net_data_init directly rather than letting 119 * the various wrapper functions make the first call. - brister 120 */ 121 122struct net_data * 123net_data_init(const char *conf_file) { 124#ifdef DO_PTHREADS 125#ifndef LIBBIND_MUTEX_INITIALIZER 126#define LIBBIND_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER 127#endif 128 static pthread_mutex_t keylock = LIBBIND_MUTEX_INITIALIZER; 129 struct net_data *net_data; 130 131 if (!once) { 132 if (pthread_mutex_lock(&keylock) != 0) 133 return (NULL); 134 if (!once) { 135 if (pthread_key_create(&key, net_data_destroy) != 0) { 136 (void)pthread_mutex_unlock(&keylock); 137 return (NULL); 138 } 139 once = 1; 140 } 141 if (pthread_mutex_unlock(&keylock) != 0) 142 return (NULL); 143 } 144 net_data = pthread_getspecific(key); 145#endif 146 147 if (net_data == NULL) { 148 net_data = net_data_create(conf_file); 149 if (net_data == NULL) 150 return (NULL); 151#ifdef DO_PTHREADS 152 if (pthread_setspecific(key, net_data) != 0) { 153 net_data_destroy(net_data); 154 return (NULL); 155 } 156#endif 157 } 158 159 return (net_data); 160} 161 162struct net_data * 163net_data_create(const char *conf_file) { 164 struct net_data *net_data; 165 166 net_data = memget(sizeof (struct net_data)); 167 if (net_data == NULL) 168 return (NULL); 169 memset(net_data, 0, sizeof (struct net_data)); 170 171 if ((net_data->irs = irs_gen_acc("", conf_file)) == NULL) { 172 memput(net_data, sizeof (struct net_data)); 173 return (NULL); 174 } 175#ifndef DO_PTHREADS 176 (*net_data->irs->res_set)(net_data->irs, &_res, NULL); 177#endif 178 179 net_data->res = (*net_data->irs->res_get)(net_data->irs); 180 if (net_data->res == NULL) { 181 (*net_data->irs->close)(net_data->irs); 182 memput(net_data, sizeof (struct net_data)); 183 return (NULL); 184 } 185 186 if ((net_data->res->options & RES_INIT) == 0U && 187 res_ninit(net_data->res) == -1) { 188 (*net_data->irs->close)(net_data->irs); 189 memput(net_data, sizeof (struct net_data)); 190 return (NULL); 191 } 192 193 return (net_data); 194} 195 196void 197net_data_minimize(struct net_data *net_data) { 198 res_nclose(net_data->res); 199} 200 201#ifdef _REENTRANT 202struct __res_state * 203__res_state(void) { 204 /* NULL param here means use the default config file. */ 205 struct net_data *net_data = net_data_init(NULL); 206 if (net_data && net_data->res) 207 return (net_data->res); 208 209 return (&_res); 210} 211#else 212#ifdef __linux 213struct __res_state * 214__res_state(void) { 215 return (&_res); 216} 217#endif 218#endif 219 220int * 221__h_errno(void) { 222 /* NULL param here means use the default config file. */ 223 struct net_data *net_data = net_data_init(NULL); 224 if (net_data && net_data->res) 225 return (&net_data->res->res_h_errno); 226#if !(__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 3) 227 return(&_res.res_h_errno); 228#else 229 return (&h_errno); 230#endif 231} 232 233void 234__h_errno_set(struct __res_state *res, int err) { 235 236 237#if (__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 3) 238 res->res_h_errno = err; 239#else 240 h_errno = res->res_h_errno = err; 241#endif 242} 243 244#endif /*__BIND_NOSTATIC*/ 245 246/*! \file */ 247